I suspect issue tracking software is one of those domains where if a piece of code hangs around for long enough it will become a mess due to incentives. Which b

I suspect issue tracking software is one of those domains where if a piece of code hangs around for long enough it will become a mess due to incentives. Which begs the question: What are y'all's opinion on the open source competitors? Redmine, OpenProject, Apache Bloodhound, and whatever else exists?